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WaterSafeCheck
Official EPA SDWIS Statewide AnalysisState Water Quality & Testing Directory

Washington Drinking Water Quality & Testing Directory

Comprehensive EPA compliance records, water testing guidelines, and city rankings covering all 726 ZIP codes across Washington

Quick Summary: Is Tap Water Safe in Washington?

Drinking water in Washington receives an average composite safety score of 77.9/100 based on EPA Safe Drinking Water Act records. Approximately 40% of monitored ZIP codes earn an "A" grade. Water sources are 40.8% surface water and 59.2% groundwater, resulting in Hard to Very Hard mineral hardness across the state.

Total ZIP Codes

726

Health Violations (5yr)

121

Statewide Avg Score

77.9/100

High Lead Risk Areas

36.6%

Overview: Drinking Water in Washington

Drinking water quality in Washington averages a composite safety score of 77.9/100 across its 726 monitored ZIP codes. Approximately 40% of ZIP codes in the state receive an "A" grade, while 0% receive an "F" grade. Environmental standards are enforced by Washington State Department of Health.

Surface Water

40.8%

of ZIP codes

Total Violations

1,630

5-year record

Grade A ZIPs

287

40% of state

Grade F ZIPs

0

0% of state

Water Quality Grade Distribution in Washington

How do Washington's 726 ZIP codes stack up by water quality grade?

A
287 ZIP codes40%
B
213 ZIP codes29%
C
148 ZIP codes20%
D
78 ZIP codes11%
F
0 ZIP codes0%

Popular Cities in Washington

Click any city to view ZIP code-level water quality reports

Seattle

62 ZIPs

A

Tacoma

38 ZIPs

A

Spokane

29 ZIPs

C

Vancouver

14 ZIPs

C

Olympia

11 ZIPs

A

Everett

8 ZIPs

A

Bellevue

7 ZIPs

B

Kent

7 ZIPs

A

Yakima

7 ZIPs

B

Lakewood

6 ZIPs

A

Renton

5 ZIPs

A

Bellingham

5 ZIPs

A

Bremerton

5 ZIPs

A

Puyallup

5 ZIPs

A

Auburn

4 ZIPs

A

Federal Way

4 ZIPs

A

Bothell

4 ZIPs

B

Lynnwood

4 ZIPs

B

Kirkland

3 ZIPs

A

Redmond

3 ZIPs

A

Snohomish

3 ZIPs

B

Gig Harbor

3 ZIPs

A

Pullman

3 ZIPs

B

Kennewick

3 ZIPs

C

Edmonds

2 ZIPs

A

Issaquah

2 ZIPs

B

Woodinville

2 ZIPs

A

Sammamish

2 ZIPs

A

Blaine

2 ZIPs

A

Marysville

2 ZIPs

A

Mount Vernon

2 ZIPs

A

Oak Harbor

2 ZIPs

C

Silverdale

2 ZIPs

A

Sumner

2 ZIPs

A

Port Angeles

2 ZIPs

A

Port Orchard

2 ZIPs

A

Lacey

2 ZIPs

A

Wenatchee

2 ZIPs

A

Pasco

2 ZIPs

B

Richland

2 ZIPs

B

City A-Z Directory — Washington

Browse water quality reports for every town and city in Washington.

A
AberdeenAcmeAddyAdnaAirway HeightsAlbionAllynAlmiraAmanda ParkAmboyAnacortesAnatoneAnderson IslandAppletonArdenvoirArielArlingtonAshfordAsotinAuburn
B
Bainbridge IslandBaringBattle GroundBay CenterBeaverBelfairBellevueBellinghamBelmontBengeBenton CityBeverlyBickletonBingenBlack DiamondBlaineBlakely IslandBonney LakeBothellBowBoydsBremertonBrewsterBridgeportBrinnonBrownstownBrush PrairieBuckleyBucodaBuenaBurbankBurleyBurlingtonBurton
C
Camano IslandCamasCamp MurrayCarbonadoCarlsborgCarltonCarnationCarrollsCarsonCashmereCastle RockCathlametCentervilleCentraliaChattaroyChehalisChelanChelan FallsCheneyChewelahChimacumChinookCinebarClallam BayClarkstonClaytonCle ElumClearlakeClintonColbertColfaxCollege PlaceColtonColvilleConconullyConcreteConnellConwayCopalis BeachCopalis CrossingCosmopolisCougarCoulee CityCoulee DamCoupevilleCowicheCrestonCurlewCurtisCusickCuster
D
DallesportDanvilleDarringtonDavenportDaytonDeer HarborDeer ParkDemingDixieDotyDrydenDupontDuvall
E
East OlympiaEast WenatcheeEastonEastsoundEatonvilleEdmondsEdwallElbeElectric CityElkEllensburgElmaElmer CityEltopiaEndicottEntiatEnumclawEphrataEthelEvansEverettEverson
F
Fairchild Air Force BaseFairfieldFall CityFarmingtonFederal WayFerndaleFordForksFour LakesFox IslandFreelandFriday HarborFruitland
G
GalvinGarfieldGeorgeGiffordGig HarborGlenomaGlenwoodGold BarGoldendaleGrahamGrand CouleeGrandviewGrangerGranite FallsGrapeviewGraylandGrays RiverGreenacresGreenbank
H
HamiltonHansvilleHarrahHarringtonHartlineHayHeissonHobartHoodsportHooperHoquiamHumptulipsHuntersHusum
I
IlwacoIncheliumIndexIndianolaIoneIssaquah
J
Joyce
K
KahlotusKalamaKapowsinKellerKelsoKenmoreKennewickKentKettle FallsKeyportKingstonKirklandKittitasKlickitat
L
La CenterLa ConnerLa GrandeLa PushLaceyLacrosseLake StevensLakebayLakewoodLamonaLamontLangleyLatahLaurierLeavenworthLebamLiberty LakeLilliwaupLincolnLindLittlerockLong BeachLongbranchLongmireLongviewLoomisLoon LakeLopez IslandLummi IslandLyleLymanLyndenLynnwood
M
MabtonMalagaMaldenMaloMaloneMalottManchesterMansfieldMansonMaple FallsMaple ValleyMarblemountMarcusMarlinMarshallMarysvilleMatlockMattawaMazamaMcchord AfbMcclearyMckennaMeadMedical LakeMedinaMenloMercer IslandMesaMetalineMetaline FallsMethowMicaMill CreekMiltonMineralMoclipsMohlerMonitorMonroeMontesanoMortonMoses LakeMossyrockMount VernonMountlake TerraceMoxeeMukilteo
N
NachesNahcottaNapavineNaselleNeah BayNeiltonNespelemNewman LakeNewportNine Mile FallsNooksackNordlandNorth BendNorth BonnevilleNorth LakewoodNorthport
O
Oak HarborOakesdaleOakvilleOcean ParkOcean ShoresOdessaOkanoganOlallaOlgaOlympiaOmakOnalaskaOrcasOrientOrondoOrovilleOrtingOthelloOtis OrchardsOutlookOysterville
P
PacificPacific BeachPackwoodPalisadesPalouseParadise InnParkerPascoPaterosPatersonPe EllPeshastinPlymouthPoint RobertsPomeroyPort AngelesPort GamblePort HadlockPort LudlowPort OrchardPort TownsendPoulsboPrescottPrestonProsserPullmanPuyallup
Q
QuilceneQuinaultQuincy
R
RainierRandleRavensdaleRaymondReardanRedmondRentonRepublicRetsilRiceRichlandRidgefieldRitzvilleRiversideRochesterRock IslandRockfordRockportRollingbayRonaldRooseveltRosaliaRosburgRoslynRoyRoyal CityRyderwood
S
Saint JohnSalkumSammamishSatsopSeabeckSeahurstSeattleSeaviewSedro WoolleySekiuSelahSequimShaw IslandSheltonSilvanaSilver CreekSilverdaleSilverlakeSkamokawaSkykomishSnohomishSnoqualmieSnoqualmie PassSoap LakeSouth BendSouth Cle ElumSouth ColbySouth PrairieSouthworthSpanawaySpangleSpokaneSpragueSpringdaleStanwoodStarbuckStartupStehekinSteilacoomSteptoeStevensonStratfordSultanSumasSumnerSunnysideSuquamish
T
TacomaTaholahTahuyaTekoaTeninoThorntonThorpTietonTokelandToledoTonasketToppenishTouchetToutleTracytonTrout LakeTumtumTumwaterTwisp
U
UnderwoodUnionUniontownUniversity PlaceUsk
V
VaderValleyValleyfordVancouverVantageVashonVaughnVeradale
W
WahkiacusWaitsburgWaldronWalla WallaWallulaWapatoWardenWashougalWashtucnaWatervilleWaucondaWaunaWaverlyWellpinitWenatcheeWest RichlandWestportWhite SalmonWhite SwanWilburWilkesonWilson CreekWinlockWinthropWishramWoodinvilleWoodland
Y
YacoltYakimaYelm
Z
Zillah

🏆 Highest Rated ZIP Codes in Washington

98035Kent
99/100
A
98064Kent
99/100
A
98089Kent
99/100
A
98111Seattle
99/100
A
98113Seattle
99/100
A

⚠ Lowest Rated ZIP Codes in Washington

98601Amboy
40/100
D
98603Ariel
40/100
D
98616Cougar
40/100
D
98819Conconully
40/100
D
98827Loomis
40/100
D

Common Drinking Water Contaminants in Washington

The following are common regulated contaminants found in Washington drinking water based on EPA violation records. Click any contaminant to learn about EPA safety limits and health effects.

Stage 1 DBP RuleConsumer Confidence Report RuleHaloacetic Acids (HAA5)E. coliLeadTotal Trihalomethanes (TTHM)Contaminant 0800Fecal Coliform

Source: EPA Safe Drinking Water Act Maximum Contaminant Level regulations. For the complete list of regulated contaminants and MCLs, see the Water Quality Safety Guide.

Frequently Asked Questions — Washington Drinking Water

Is tap water generally safe to drink in Washington?+
Yes, for the majority of residents, tap water in Washington is treated and regulated. However, compliance varies by city. State-wide, 287 ZIP codes receive an "A" grade, while 0 receive an "F". Search your specific ZIP code to see your local utility's record.
How do I test water quality or well water in Washington?+
Residents in Washington can test their tap or well water by contacting laboratories certified by Washington State Department of Health or ordering an EPA-standard laboratory water testing kit. Annual testing is recommended for private wells to test for bacteria, nitrates, and heavy metals.
What are the biggest water quality issues in Washington?+
The primary issues include managing 121 health-based violations state-wide and resolving infrastructure age. 36.6% of ZIP codes in the state have a high probability of lead exposure risk due to pre-1986 piping.
Who regulates and enforces drinking water standards in Washington?+
Drinking water in Washington is regulated by Washington State Department of Health under a primacy agreement with the U.S. EPA.
Where does Washington get its drinking water?+
Approximately 40.8% of monitored areas in Washington rely on surface water sources (lakes/rivers), while the rest use groundwater aquifers.
How do I find the official water quality report for my home in Washington?+
Search your ZIP code on our site to view data compiled from EPA records, or contact your local utility for their annual Consumer Confidence Report (CCR).
View All 726 ZIP Codes in Washington

Browse EPA water quality data for every monitored ZIP code. For faster results, use the search bar above.

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All 726 ZIP codes in Washington are actively monitored under the EPA Safe Drinking Water Act.